Hydrangea plant named `Vienna Rawi`

ABSTRACT

A new and distinct cultivar of Hydrangea named `Vienna Rawi`, particularly characterized by the bright fuchsia color of the flowers, early growth, storable in the cold and lack of need for chemical growth regulators in the early stae of cultivation and during forcing.

BACKGROUND OF THE NEW PLANT

The present invention comprises a new and distinct cultivar of Hydrangeamacrophylla known by the varietal name `Vienna Rawi`.

The new cultivar is the product of a planned breeding program which hadthe objectives of creating a new hydrangea with full and richbright-colored flowers which survive periods of cool storage, remain onthe plant during forcing and require little or no growth regulator.

The new cultivar was selected from a population of seedlings of unknownparentage maintained by Rampp Jungpflanzen OHG, D-8949 Pfaffenhausen,Mindelbergstrasse 7, Postfach 29, Germany. Selection was made by thebreeders at Rampp Jungpflanzen OHG in 1994.

Asexual reproduction was accomplished when cuttings were taken from themother plant and tissue cultured.

The new cultivar has not been observed under all possible environmentalconditions. The phenotype may vary with variations in environment suchas temperature, light intensity and day length. The followingobservations, measurements and comparisons describe plants pinched oncein autumn and grown in 13 cm pots in Pfaffenhausen under greenhouseconditions which approximate those generally used in commercialpractice.

The following traits have been repeatedly observed and are determined tobe basic characteristics of the new cultivar which in combinationdistinguish this Hydrangea as a new and distinct cultivar.

1) Bright fuchsia colored flowers.

2) Early growth.

3) Storable in the cold.

4) No chemical growth regulators necessary in the early stage ofcultivation nor during forcing.

DESCRIPTION OF THE DRAWING

The accompanying color photographic drawing shows typical flowercharacteristics of the new cultivar, with colors being as true aspossible with illustrations of this type.

DESCRIPTION OF THE NEW PLANT

In the following description, color references are made to The RoyalHorticultural Society Colour Chart.

The Plant

Classification:

Botanic.--Hydrangea macrophylla.

Commercial.--Pot Hydrangea.

Growth:

Approximate height of the plant measured from the soil line.--About 12cm.

Outdoor growth requirements.--The plants are hardy, but only in mildtemperate climates. Plants need protection in winter in colder temperateclimates, especially when small. The plants prefer indirect light todirect sunlight and windy areas should be avoided.

Rooting conditions.--Six weeks of high humidity in a shaded greenhouse.Temperature, especially the substrate temperature, should not be higherthan 20 ° C.

Branching after nipping off.--Two branches grow where a single branch ispinched. Plants are pinched after growth of 2 or 3 pairs of leaves.

Time of bud formation.--3 months after the last pinching.

Suitability for early forcing.--Depending on the state of maturity, theplants can be forced early. Supplemental light is necessary to force thehydrangeas early. In any case, for early forcing, flower buds shouldreach a stage of development in which the calyx of the flower is not yetopened, but when the flower is examined under a microscope, individualflorets and the petals thereof are distinguishable. Forcing is performedon the plants after winter storage or cold storage at low temperature,preferably at 5° C under reduced light for at least 6 weeks.

Time of first flowering.--The plants can be set up for forcing after1000 hours at 5° C. Flowering occurs after at least 6 weeks under lowlight winter conditions. Flowering is sooner later in the year.

Time of late flowering.--Plants stored at 5° C can be forced at any timelater in the year if the storage temperature is completely controlled.

Number of flowers after nipping off.--Each branch usually has a singleterminal flower.

Habit.--Compact.

Number of pairs of leaves per branch.--About 4-5.

Flower stem: Strong, can readily hold the flowers.

Trunk and branches: Woody.

Leaves:

Arrangement.--Opposite.

Surface quality.--Rough.

Shape.--Deltoid.

Tips.--Acuminate.

Bases.--Obtuse.

Margins.--Crenate.

Size.--Length: 15.5 cm. Width: 11 cm.

Petiole length.--1.25-2.5 cm.

Veination.--Pinnate.

Underside coloration.--Light green.

Color.--Yellow-green group 147A.

The Flower

Umbel:

Form.--Compound, ball-shaped with about 30-50 barren florets and about15-25 fertile florets per umbel. Usually, two barren florets and onefertile floret are present per umbellet, the pedicels of the barrenflorets are longer than the pedicels of the fertile florets so that thefertile florets are below the barren florets in the flower.

Size.--12.5 cm in diameter.

Barren flowers:

Size.--About 2.5-3.75 cm.

Number of petals.--Four.

Petal shape.--Margins are entire.

Color.--Upper surface: Red-purple group 63B.

Lower surface: Red-purple group 57D. Immature barren florets exhibit acream-colored throat.

Fertile flowers: Inconspicuous with small calyx having four small greenpetals and four stamens.

Fragrance.--Faintly sweet, if at all.

Flower bud.--Globular, about 2-4 mm, develops and opens slowly over twoweeks after forcing.

Endurance

Disease resistance: Low risk of Botrytis.

Temperature resistance: The plant is for indoor use. The small leavesallow the plants to survive cool storage much better than othervarieties in this market class.

Lasting qualities: This variety lasts much longer than other varietiesin this market class. Fertile florets last about 1 week. Barren floretsretain their color for about 6-8 weeks and turn green as chlorophylldevelops in the petals. The umbels last for months.

We claim:
 1. A new and distinct variety of Hydrangea plant substantiallyas shown and described.